Soccer players have been reported to perform less high-intensity running at the beginning of the second half compared with the first half of a match. Such an effect is likely due to a decline in muscle temperatures during half time.

Fatigue, or rather not optimal physical performance, may develop during high-level soccer games I) after short-term intense periods in both halves, II) in the initial phase of the second half, and III) towards the end of the game.

Knowledge about physiological development of young players is important in order to understand and plan their physical and technical development in soccer. This article explains the most important issues of pre-pubertal and pubertal growth.

The Yo-Yo tests contain running activities that are relevant for many sports. The tests can be performed by both men and women of all ages. The tests can also be used for assessing the physical capacity of young athletes.

A plan called a system of play governs the way players act individually and together with others on the pitch. Such a system consists of a starting formation and guidelines for carrying out the primary functions in attacking and defensive play.